Drill-brace.



J. GESSERT.

DRILL BRAGE. APPLIOATION FILED oo'r. 24, 1907.

PatentedjJune 15, 1909.

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J. GESSERT.

DRILL BRAGB.

ArrLloATIoN FILED 00124, 1907.

Patented June 15,1909.

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Inventor: are# 25M,

UNTE STATES PA'PENT OFFICE.

JACOB GESSERT, OF ROCHESTER, NEW YORK.

DRILL-BRACE To all whom it may conce-rn:

Be it known that l, JACOB Gnssnnr, of Rochester, in the county of Monroe and State ot N ew York, have invented a new and useful lmprovement in Drill-Braces, which improvement is fully set forth in the following` specification and shown in the accomp anying,` drawings.

My present invention is a drill-brace or ratchet drill designed more particularly for conveniently boring; holes into or through metal plates or similar' bodies near to other objects or parts and of ditlieult access, or where the room or space in which the brace is used is small and contracted.

T his invention is in the nature oi" a continuation of, or improvement upon, the invention shown and set forth in Letters Patent No. 812,198, issued to me February 18th, 1.906, and it embodies new features and important improvements upon the said patented invention.

One object among` others oi my present invention is to provide means for determining approximatelyT the depth to which the drill shall a( yance in. boring' a hole in any given case, and so arranging the coacting parts that when a hole is bored to the prearranged depth the feed motion will automatically reverse and so operate to draw the drill out et the hole bored by a continued action of the operating' handle and without any inconvenient or troublesome n'ianipulation of the parts being` necessary.

Other novel features of this invention, and the advantages resulting from their employment, will be brought out and made to appear in the following description, and the details of the improved constructirm par ticularly pointed out in the appended claims, reference being had to the accompanying .lrawings which, with the reieren ce numerals marked thereon, i'orm a part of this specilication.

Figure 1 is a side elevation of the drillbrace with a part of the sleeve broken away and longitudinally sectioned, the sleeve being shown in various positions by full and by dotted lines. Fig. 2 is a plan of the head of the brace and associated parts seen as indicated by arrow a in Fig. 1, parts being` broken avi/'ay and horizontally sectioned. Fig. 3 is a plan of the drum and associated parts, the horizontal section being' on the broken dotted line C c in Fig. 1.. Fig. 4 is a central longitudinal section of the head of the Specification of Letters Patent.

Application filed October 24, 1907.

Patented June 15, 1909.

Serial No. 398,944.

brace and associated parts taken on the dotted line Zi in Fig. 2. Fig. 5 is an elevation of the head of the brace seen as indicated by arrow d in Fig. 1, the handle and the thimble being` transversely sectioned as on the dotted line at the point of the arrow, parts being' broken away. Fig. 6 is a vertical transverse section of the head and some associated parts taken on the dotted line f in Fig. 2. Fig. 7 is a horizontal longitudinal section of parts beneath the drum taken on the dotted line e e in Fig. 4, further showing the interior construction, parts being shown in two positions by full and by dotted lines. Fig. 8 is a side elevation ot the drum and associated parts seen as indicated by arrow 7i in Fig. 1, a part of the disk being` broken out and parts shown in various positions by full and by dotted lines. Fig. 0 is a plan of the lower end ol the drum, a part being broken out and horizontally sectioned on the dotted line g in Fig. S. Fie'. 10 is a plan ot' the drill-stock detached. Fig'. 1 1 is a view ot the upper end ot the core piece holding` the nut tor the feedscrew. Fig. 12, drawn to a reduced scale, is a plan of the handle and some associated parts showing, by dotted lines, the manner in which the handle breaks for various uses, the thinibles being` longitudinally sectioned. Fig. 13 is a plan of the stop-mechanism for the advance ol the drill, detached, parts being horizontally sectioned. Fig'. 14 shows the cam disks detached. Fig. 15 is a face view oi one of the cam disks or cams for controlling the twin pawls. Fig. 16 shows a simple modiiication in the construction ot the pawls. Figs. 7 to 11 and 13 to 16 inclusive are drawn full size and the remaining figures except 12, are drawn 'live-sixth size.

Referring` to the parts shown 1, Figs. 1, 2, 4, 5 and 6, is the head of the drill-brace and 2 the operating handle for turning` the parts. The head 1 carries a hollow drum 3, Figs. 1, 3, 4, 5, 8 and 9, holding', among other parts, a hollow core piece 4, Figs. 4 and 11, having' at its upper end a nut 5 for a feed-screw 6. The head 7 of the feed-screw occupies an opening central in the circular portion 8 of the head 1 and is held to place therein by a pair of radially-disposed flat keys 9, Figs. 1 and 2, seated in oppositely disposed cavities in the part 8 and entering` at their inner concave ends an annular' groove 10, Figs. 4 and 8, in the head 7 of the screw, the core piece, the nut and the feed-screw being coaxial with the drum. The head of the feed-screw Vio extends a short distance above the head 1 and is tapered to a point to bear against a convenient part 58 to hold the brace against the pressure upon the point of the drill when operating the device. The core piece 4 is designed torevolve freely within the drum 3 but it is held against longitudinal movements therein by a pair of opposing horizontal flat keys 11, Figs. 1 and 9, similar to the keys 9, occupying transverse openings 12, Fig. 3, in opposite sides of the drum. The inner ends of these keys 11 are concaved and project into an annular groove 13, Fig. 4, in the core piece 4.

The feed-screw 6 is provided with a circular disk 14 immediately beneath the head 7 and against the circular part 3 of the head 1, Figs. 1, 4, 5 and 8, rigid with the feed-screw, there being a pair of small rods 15, Figs. 3, 4 and 8, rigidly fixed to the disk 14 and projecting into vertical tubes or sleeves 16 occupying corresponding cylindrical chambers in the drum 3. The rods 15 are disposed equally on opposite sides of the screw 6 and parallel therewith, as shown, being formed at their lower ends with heads, like pistons, to cross the spaces within the respective sleeves 16. These rods and the sleeves together constitute parallel duplex connectors for the disk 14 and the drum 3, and serve, also, to prevent the disk and the feed-screw 6 having any relative rotative motion independent of the drum. The rods have longitudinal motion in the sleeves 16 and the latter have longitudinal motion in the drum, which renders these two-part connectors cX- tendible, allowing the drum to move a considerable distance toward or away from the disk as the core piece 4 with the nut 5 is turned one way or the other on the feedscrew 6, Fig. 8 showing' by full and by dotted lines the drum and the disk differently spaced. rlhe sides of the drum are formed with longitudinal slits 17, Figs. 4 and 3, to receive short pins 13 in the sleeves which prevent the latter from being at any time drawn out of the drum, the upper ends of the sleeves being also closed to prevent the escape of the headed rods 1.5 therefrom.

The core piece 4 reaches below the drum 3, as appears in Fig. 4, having its lower end made square in cross section, as appears in Fig. 7, and carrying thereon a ratchet 19, Figs. 1, 4 and 7. The eXtreme end of the core piece enters a rectangular recess 20, Figs. 4 and 10, in the upper end of a socket ring 21, Figs. 1, 4, 5 and 10, carrying a drill 22, the ring being secured to the core piece by simple fasteners 59. Thus constructed and arranged it will be understood that the core piece and the drill socket must turn with the ratchet.

The operating handle 2 is formed with a hat tapered bifurcated head 23, Figs. 1, 3, 4, 5, 7 and 12, holding the ratchet 19 between its parallel branches 24 these branches beingformed with similar opposite circular openings 25, Fig. 12, receiving within them respectively the lower cylindrical portion of the core piece 4 and the upper cylindrical portion 26 of the socket ring or drill socket 21, as appears in Fig. 4. The core piece and the drill socket together constitute a bearing for the head 23 of the handle 2 around which they inay turn reciprocally when in the act of drilling a hole.

The handle 2 turns the ratchet 19 one way or the other by means of a pair of opposing dogs or pawls 27 23, Figs. 1, 4 and 7, held to turn in horizontal directions between the jaws 24 24 of the head 23, on pivot pins 29, Figs. 3, 7 and 12. The pawls are actuated by an interposed spring 30 which tends normally to bring their operating points alternately into engagement with the ratchety 19 on opposite sides, as clearly appears in Fig. 7, the ends of the spring occupying recesses in the opposing faces of the pawls. The pawls are further controlled by a pair of oppositely acting cam disks 31 32, Figs. 1, 3, 5, 7, 12, 14 and 15, in positions to press the rear sides of the respective pawls, the inner or operating face of each disk being formed with a cavity 57 and a low or thin part 33 with incline 34 leading up to the high or thick part 35 of the disk.

The disks occupy cavities at the sides of the head 23, as shown, being joined rigidly and to turn as a single piece a connecting shaft 36 passing laterally through said head and adapted to turn freely therein. The disks are relatively so placed that the cavities 57 are substantially but not exactly opposite, the positions being such that when either pawl occupies the cavity in the adjacent disk and engages the ratchet 19 the other pawl will be held by the thick part 35 of the opposite disk temporarily away from the ratchet and so out of action. As will be seen by viewing Fig. 14 the two inclines 34 of the disks are alternated or right and left, so that as either pawl is, on account of the turning of the disks, gliding down one incline into the cavity 57 and into action with the ratchet the other pawl will be moving up the a i]acent incline out of the cavity of its coacting disk and out of action with the ratchet. Thus one pawl, as 23, may be brought into action with the ratchet by the spring 30 while the opposite pawl 27 is held by the disk 31 away in idleness against the action of said spring. By slightly turning the disks the positions of the pawls will be reversed the pawl 27 then coming into engagement with the ratchet and the pawl 23 becoming idle. By these means when the pawl 23 is engaging the ratchet, as appears by full lines in Fig. 7, a swaying of the handle 2 forward and back will cause the drill 22 to advance and bore a hole; but if the controlling disks he shifted, as stated, the feed motion will reverse and the drill withdrawn from the hole. During these retreat motions of the parts the pointed head 7 of the feedscrew is held against the fixed ohjcct hy the left hand of the operator grasping the stem or holder 60, Figs. 1 and 3, this holder serving some of the purposes of the element "lj shown and descrihed in the liettcrs Patent ahove mentioned.

The head 23 of the operating handle 2 is provided with a hollow cylindrical post 37, Figs. 1, 3, 4, 5 and 12, extending upward into a simil-arly-shaped cavity in the head 1, and provided with a slender axial spring 33. This spring is under compression, heing confined hy a screw-cap 3Q, Figs. 2 and 4, in the head 1, and acts to press the head and thc handle normally away from each other and to otherwise relatively control them. rllhe head 1 is also formed with similar circular openings in which are placed a pair of hollow cylindrical piston hodies or spring-holders 40, Figs. 5 and 6, parallel with each other and with the post 37, these piston bodies having weak or slender springs 41 mildly compressed hy screw-caps 42, Figs. 2 and 6.

A connecting frame 43, Figs. 1, 2, 5 and 6, is provided, having its upwardly-extended ends joined to the respective spring holders 4() near their upper ends, hy means of screws or pins 44, projecting through slits 61, Figs. 1 and 6, in the sides of the head 1 the lower ends of the frame heing connected with the respective disks 31 hy means of pins 4.5, Figs. 1, 3, 5 and 7. On account of this construction as the handle and associated parts move away from the head 1 hy the feed motion the connecting frame 43 and the spring-holders 40 will move with them, 1seing mildly urged that way hy the springs 41, these springs serving only to insure. these motions for the frame.

To stop the feed for controlling the depths of the hole bored in any given case a shiftat le arrester 46, Figs. 1, 2, 4, 5 and 13, is employed on the head 1. This arrester is a simple har pierced at the expanded middle hy a headed holt 47, having a clamping thumb-nut 48 of any common form. The head of the bolt is held to traverse a vertical rectangular race 49, Figs. 4 and 5, in the head 1, with the hody of the holt projecting through a slit in the head 1. The surface of the head 1 traversed by the arrester is graduated ley transverse marks 51., Fig. 5, spaced hy inches or fractions thereof as may he convenient, hy means of which the arrester may he set for depths of holes as desired. The arresting har 46 is in position to catch pins 52, Figs. 1, 2, 4, 5 and 6, of the spring-holders 40 projecting through slits 53 in the head 1, as said holders move with the handle 2 in a direction away from the head. TWhen in drilling a hole the spring-holders l i i i thus move sufficiently to hring the pins 52 against the har 46 their ad vance, with that of the connecting frame 43, will he stopped and a continued downward or onward feed of the parts will consequently cause the cam disks 31 32 to turn in the head 23. This will serve to reverse the direction of the feed motion andv so cause the drill to retreat and he readily removed from the hole drilled. And these shiftings of the parts and the reversing of the feed motion all take place while the handle 2 is continuously swung alternately forward and liackward in the act of turning the drill.

FiO. 14 is drawn to show the relative positions of the two disks 31 and 32. ine pawls 27 28 are represented hy dotted rectangles one occupying the cavity 57 in the disk 32 and the other pressing the thick part 35 of the opposing disk 31 close to the cavity 57 therein and in position to quickly pass into said cavity and assume control of the l ratchet 1.9, as the disks are turned by the connecting` frame 43, as ahove descrihed.

With this device l prefer to form the operating lever or handle 2 with two flexihle joints 54. 55, Figs. 1., 3 and 12, and provide a slidahle sleeve 56, Figs. 1, 2, 3, 5 and 7, of such length as to cover either joint alone or hoth simultaneously, as represented hy fullline and dotted-line positions in Fig. 1. ln cases where there is sufficient room for sii/'inging the handle 2 the sleeve is disposed to cover hoth joints 54 55, as shown hy dotted lines toward the left, the handle then acting as a single or one-part lever. If the space in which the lsrace is to he used is restricted in any given case the sleeve may lie moved to the position shown hy full lines covering only the joint 54, allowing the handle to hreak at the joint 55 as appears ley dotted lines in Fig. 12. lf, again, the space in which to work he very small the sleeve will lie shifted to the right, to cover the joint 55, as appears hy dotted lines in Fig. 1, allowing the handle to lireak at the joint 54, as appears also hy dotted lines in Fig. 12.

It may he dcsiralle sometimes in constructing these devices to employ two short thimlsles, 62 63, Fig. 12, for the handle 2 instead of one long thimhle 56 these short thimhlcs being adapted to cover or uncover the adjacent joints 54 55 respectively or either one singly as may he found necessary in given cases, this simple change being conprised in the invention. l also sometimes prefer to form the pawls as shown in Fig. 16 each with a cylindrical ring or hand 64 adapted to turn freely on a stud 65 projectn ving from the thick end of the pawl. These antifriction rings are in positions to receive the action of the respective disks 31 32 when turned to shift the pawls, as above stated, causing the coacting parts to move upon each other more freely and with less friction.

What I claim as my invention and desire I nut for the feed-screw held by the core piece to secure by Letters Patent is 1. In a drill brace, a feed screw, a drum coaxial with the feed screw, there being relative longitudinal. movement between the screw and drum a core piece within the drum rotatably connected thereto but held against longitudinal movement and having a coaxial cavity occupied by the feed screw, a drill socket constructed to turn with the core piece, a nut for the feed screw carried by the core piece to advance the tool, and means for causing said drum and feed screw to turn together.

2. In a drill-brace, a drum, a core piece rotatably connected to the drum but held against longitudinal movement, a feed.- screw disposed axially within the drum, a disk above the drum rigid with the feedscrew, longitudinal connectors for the disk and drum, said drum and feed-screw turning together and relatively longitudinally movable, a nut on the feed-screw within the drum connected to the core piece, a tool socket connocted to the core piece, and means for turning the nut. Y

In a drill-brace, a feed-screw and a drum coaXially disposed, a disk over the drum rigid with the feed-screw and aiding the holding of the feed-screw against rotation, a core piece rotatably connected to the drum but held against longitudinal movement, connectors for the disk and the drum each having a part rigid with the disk and vcoacting part slidable in the drum, said two parts telescoping with each other, said connectors serving to cause the drum and the feed-screw to turn together but admitting longitudinal motion one upon the other, a

vnut lor the feed-screw held within the drum and connected to the core piece, and means for turning the nut.

4. In a drill-brace a drum and a feedscrew coaXially disposed the drum constructedtoliold the feed-screw from rotation, a core piece held revolubly within the drum and rotatably connected to the drum and having an axial cavity for the feed-screw, a

within the drum, means for turning the core piece and for preventing longitudinal motion of the core piece within the drum.

5. A drill-brace having a drum and c0- aXial feed-screw turning as a single body, a hollow core piece in the drum rotatably connected to the drum but held against longitudinal movement for receiving the feedscrew, a nut in the core piece receiving said feed screw, a ratchet on the core piece beneath the drum, a socket ring on the core piece beneath the ratchet and constructed to turn with the core piece, a hand-lever held to turn upon the core piece, and pawls carried by the lever to engage the ratchet.

6. In a drill brace mechanism, a head, a core piece rotatably connected therewith, said core piece being provided with a tool socket and feeding mechanism, a hand lever rotatably mounted on said core piece for turning the latter and operating the feeding mechanism, and a spring-pressed post on said lever entering said head to cause the latter and the lever to turn together as one ieee.

7. A drill-,brace having a head and an operating handle connected to turn therewith vcoaxially, the handle being laterally movable toward and from the head, means tending to normally press the head and handle away from each other, a tool socket and driving means therefor carried by the handle, a controlling member carried by the handle for controlling the tool socket driving means, slides carried in the head to move toward or from the handle, means for connecting said. slides with-said controlling member, and a shiftable arrester on the head for said slides.

In witness whereof, I have hereunto set my hand this 19th day of October, 1907 in the presence of two subscribing Witnesses.

JACOB GESSERT.

Witnesses:

E. B. WHITMORE, A. M. WHITMORE. 

